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SN74LVC2G66: query for the usage of SN74LVC2G66

Part Number: SN74LVC2G66

hi TI,

I wonder system using SN74LVC2G66. 

I wonder, I can use below system to divide 2x region (before SN74LVC & after SN74LVC) or not. 

By using SN74LVC2G66 and setting input of SN74 is High or Low, 

Could I distinguish I2C region A and B ? 

Thanks 

  • Yes, this is possible.

    When the two regions are disconnected but still powered, you should have pull-up resistors on both to prevent the I²C lines from floating. (If there is no master in region B, you can use very weak pullups there.)

  • Minwoo,

    As long as the device is still powered on and the 'On or OFF' in your drawing is alluding to the signal at the control pin, you can definitely use it to divide the regions. 
    But I wonder if you'll get the functionality you want. Why are you trying to split the I2C bus? Is this a addressing issue you're trying to resolve? The Sn74LVC2G66 will connect the bus when you run the control pin high and you won't be able to distinguish the difference between Regions A and B by reading the I2C commands. When the devices control input is run low, the bus will isolate the 2 regions and the host won't be able to communicate to regions C and D.

    Thanks,
    Rami

  • Hi Rami, 

    Very thanks for your concerns and answer. 

    I think, previous, my explanation was not enough. 

    what I want to divide two regions using SN74LVC is the using another master in Region B. 

    when I use another master IC in region B, normally Master B (Host B) can access both slave C and D. 

    but, if Host B doesn't have debugging feature for user, at that time, I want to use Host in Region A, which has user debug path. 

    (just plan, exactly I don't know) 

    Thanks. 

  • Minwoo,

    Thanks for the clear clarification. This should work just fine if it's the route you take. Good luck!

    Rami